Kina is a complete art in it's own right - one of the Filipino Martial Arts.
There are various ways to bite in combat.
For now we only want to concern ourselves with the basic few.
In CRA, at clinch bite ear or nose.
Bite face
In Last Resort life or death bite his throat
On the ground in Mount or Guard, same kina
If caught in rear choke, "sweetcorn" the forearm
Juji - "steak out" the leg muscle
headlock - "steak out" the torso - flank or pec